Rename get_all in stram_events; update rebuilder example (#108)

CHANGELOG.md

@@ -49,7 +49,7 @@ Refer to: [#107]
   - `new` function is now sync and its return value is no longer a `Result` but `Self`. Removed `Aggregate` type param.
   - `new` takes ownership of pool; removed projectors and policies params. Use `set_projectors` or `set_policies` 
     instead to add them to the store.
-  - `rebuild_events` renamed into `get_all`.
+  - `rebuild_events` renamed into `stream_events`. Now it takes an `sqlx::Executor` parameter.
   - policies behaviour is now that if one of them fails they fail silently. (override this behaviour with 
     `Aggregate::store_events` using `EventStore::persist` function).
   - `Event` and `Error` trait generic params removed in favour of `Manager: AggregateManager`.

examples/rebuild_shared_projection/src/main.rs

@@ -28,8 +28,8 @@ async fn main() {
     let store_a = AggregateA::new(&pool).await.unwrap().event_store;
     let store_b = AggregateB::new(&pool).await.unwrap().event_store;
 
-    let mut events_a = store_a.get_all();
-    let mut events_b = store_b.get_all();
+    let mut events_a = store_a.stream_events(&pool);
+    let mut events_b = store_b.stream_events(&pool);
 
     let mut event_a_opt: Option<Result<StoreEvent<EventA>, CounterError>> = events_a.next().await;
     let mut event_b_opt: Option<Result<StoreEvent<EventB>, CounterError>> = events_b.next().await;

examples/rebuilder/Cargo.toml

@@ -12,6 +12,7 @@ version = "0.1.0"
 
 # async main
 tokio = { version = "1.6", features = ["full"] }
+futures-util = "0.3"
 
 esrs = { version = "*", path = "../../", features = ["postgres"] }
 simple_projection = { version = "*", path = "../simple_projection/" }

examples/rebuilder/src/main.rs

@@ -1,8 +1,9 @@
-use chrono::{DateTime, Utc};
-use serde_json::Value;
 use std::convert::TryInto;
 use std::fmt::Debug;
 
+use chrono::{DateTime, Utc};
+use futures_util::stream::StreamExt;
+use serde_json::Value;
 use sqlx::migrate::MigrateDatabase;
 use sqlx::{pool::PoolOptions, Pool, Postgres, Transaction};
 use uuid::Uuid;
@@ -111,27 +112,25 @@ async fn main() {
 
     let mut transaction = pool.begin().await.unwrap();
 
-    let events = sqlx::query_as::<_, Event>("SELECT * FROM counter_events")
-        .fetch_all(&mut *transaction)
+    let events: Vec<StoreEvent<CounterEvent>> = aggregate
+        .event_store
+        .stream_events(&mut transaction)
+        .collect::<Vec<Result<StoreEvent<CounterEvent>, CounterError>>>()
         .await
-        .unwrap();
-
-    let counter_events: Vec<StoreEvent<CounterEvent>> = events
         .into_iter()
-        .map(TryInto::try_into)
-        .collect::<Result<Vec<StoreEvent<CounterEvent>>, serde_json::Error>>()
-        .unwrap();
+        .collect::<Result<Vec<StoreEvent<CounterEvent>>, CounterError>>()
+        .expect("Failed to get all events from event_table");
 
     sqlx::query("TRUNCATE TABLE counters")
-        .execute(&mut *transaction)
+        .execute(&mut transaction)
         .await
         .expect("Failed to drop table");
 
     // Assert the counter doesn't exist
-    let res = Counter::by_id(count_id, &mut *transaction).await.expect("Query failed");
+    let res = Counter::by_id(count_id, &mut transaction).await.expect("Query failed");
     assert!(res.is_none());
 
-    rebuild_all_at_once(counter_events, projectors.as_slice(), &mut transaction).await;
+    rebuild_all_at_once(events, projectors.as_slice(), &mut transaction).await;
 
     transaction.commit().await.unwrap();
 

examples/simple_projection/src/aggregate.rs

@@ -7,7 +7,7 @@ use crate::projector::CounterProjector;
 use crate::structs::{CounterCommand, CounterError, CounterEvent};
 
 pub struct CounterAggregate {
-    event_store: PgStore<Self>,
+    pub event_store: PgStore<Self>,
 }
 
 impl CounterAggregate {

src/esrs/postgres/store.rs

@@ -132,14 +132,14 @@ where
 
     /// This function returns a stream representing the full event store table content. This should
     /// be mainly used to rebuild read models.
-    pub fn get_all(&self) -> BoxStream<Result<StoreEvent<Manager::Event>, Manager::Error>> {
+    pub fn stream_events<'s>(
+        &'s self,
+        executor: impl Executor<'s, Database = Postgres> + 's,
+    ) -> BoxStream<Result<StoreEvent<Manager::Event>, Manager::Error>> {
         Box::pin({
             sqlx::query_as::<_, event::Event>(self.inner.statements.select_all())
-                .fetch(&self.inner.pool)
-                .map(|res| match res {
-                    Ok(event) => event.try_into().map_err(Into::into),
-                    Err(error) => Err(error.into()),
-                })
+                .fetch(executor)
+                .map(|res| Ok(res?.try_into()?))
         })
     }